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The Moon's heavily cratered far-side. The origin of the Moon is usually explained by a Mars-sized body striking the Earth, creating a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed.
Artist's depiction of a collision between two planetary bodies. Such an impact between Earth and a Mars-sized object likely formed the Moon.. The giant-impact hypothesis, sometimes called the Theia Impact, is an astrogeology hypothesis for the formation of the Moon first proposed in 1946 by Canadian geologist Reginald Daly.
Theia (/ ˈ θ iː ə /) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.
“The chlorine loss from the moon likely happened during a high-energy and heat event, which points to the Giant Impact theory,” Gargano, one of the lead researchers, says in a NASA press release.
Theia, an ancient planet, collided with Earth to form the moon, scientists believe. A new study suggests Theia could have also formed mysterious blobs called large low-velocity provinces, or LLVPs.
Scientists have long theorized that Charon formed much like Earth’s moon, which was created after a Mars-size object slammed into our planet. The impact sent molten debris from Earth flying into ...
The competing theories were: volcanic eruptions blasting holes in the Moon; meteoric impact; a theory known as the Welteislehre developed in Germany between the two world wars which suggested glacial motion creating the craters. Grove Karl Gilbert suggested in 1893 that the Moon's craters were formed by large asteroid impacts.
An old theory about how Earth’s moon was formed is getting a second look. An old theory about how Earth’s moon was formed is getting a second look.